drivers/net/wireless/intel/iwlwifi/mvm/quota.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  * Copyright(c) 2016        Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  24  * USA
  25  *
  26  * The full GNU General Public License is included in this distribution
  27  * in the file called COPYING.
  28  *
  29  * Contact Information:
  30  *  Intel Linux Wireless <linuxwifi@intel.com>
  31  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  32  *
  33  * BSD LICENSE
  34  *
  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  37  * Copyright(c) 2016        Intel Deutschland GmbH
  38  * All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  *
  44  *  * Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  *  * Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in
  48  *    the documentation and/or other materials provided with the
  49  *    distribution.
  50  *  * Neither the name Intel Corporation nor the names of its
  51  *    contributors may be used to endorse or promote products derived
  52  *    from this software without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  55  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  56  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  57  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  58  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  59  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  60  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  61  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  62  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  63  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  64  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  65  *
  66  *****************************************************************************/
  67
  68 #include <net/mac80211.h>
  69 #include "fw-api.h"
  70 #include "mvm.h"
  71
  72 #define QUOTA_100       IWL_MVM_MAX_QUOTA
  73 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
  74
  75 struct iwl_mvm_quota_iterator_data {
  76         int n_interfaces[MAX_BINDINGS];
  77         int colors[MAX_BINDINGS];
  78         int low_latency[MAX_BINDINGS];
  79 #ifdef CONFIG_IWLWIFI_DEBUGFS
  80         int dbgfs_min[MAX_BINDINGS];
  81 #endif
  82         int n_low_latency_bindings;
  83         struct ieee80211_vif *disabled_vif;
  84 };
  85
  86 static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
  87                                    struct ieee80211_vif *vif)
  88 {
  89         struct iwl_mvm_quota_iterator_data *data = _data;
  90         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  91         u16 id;
  92
  93         /* skip disabled interfaces here immediately */
  94         if (vif == data->disabled_vif)
  95                 return;
  96
  97         if (!mvmvif->phy_ctxt)
  98                 return;
  99
 100         /* currently, PHY ID == binding ID */
 101         id = mvmvif->phy_ctxt->id;
 102
 103         /* need at least one binding per PHY */
 104         BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
 105
 106         if (WARN_ON_ONCE(id >= MAX_BINDINGS))
 107                 return;
 108
 109         switch (vif->type) {
 110         case NL80211_IFTYPE_STATION:
 111                 if (vif->bss_conf.assoc)
 112                         break;
 113                 return;
 114         case NL80211_IFTYPE_AP:
 115         case NL80211_IFTYPE_ADHOC:
 116                 if (mvmvif->ap_ibss_active)
 117                         break;
 118                 return;
 119         case NL80211_IFTYPE_MONITOR:
 120                 if (mvmvif->monitor_active)
 121                         break;
 122                 return;
 123         case NL80211_IFTYPE_P2P_DEVICE:
 124                 return;
 125         default:
 126                 WARN_ON_ONCE(1);
 127                 return;
 128         }
 129
 130         if (data->colors[id] < 0)
 131                 data->colors[id] = mvmvif->phy_ctxt->color;
 132         else
 133                 WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
 134
 135         data->n_interfaces[id]++;
 136
 137 #ifdef CONFIG_IWLWIFI_DEBUGFS
 138         if (mvmvif->dbgfs_quota_min)
 139                 data->dbgfs_min[id] = max(data->dbgfs_min[id],
 140                                           mvmvif->dbgfs_quota_min);
 141 #endif
 142
 143         if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
 144                 data->n_low_latency_bindings++;
 145                 data->low_latency[id] = true;
 146         }
 147 }
 148
 149 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
 150                                          struct iwl_time_quota_cmd *cmd)
 151 {
 152 #ifdef CONFIG_NL80211_TESTMODE
 153         struct iwl_mvm_vif *mvmvif;
 154         int i, phy_id = -1, beacon_int = 0;
 155
 156         if (!mvm->noa_duration || !mvm->noa_vif)
 157                 return;
 158
 159         mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
 160         if (!mvmvif->ap_ibss_active)
 161                 return;
 162
 163         phy_id = mvmvif->phy_ctxt->id;
 164         beacon_int = mvm->noa_vif->bss_conf.beacon_int;
 165
 166         for (i = 0; i < MAX_BINDINGS; i++) {
 167                 u32 id_n_c = le32_to_cpu(cmd->quotas[i].id_and_color);
 168                 u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
 169                 u32 quota = le32_to_cpu(cmd->quotas[i].quota);
 170
 171                 if (id != phy_id)
 172                         continue;
 173
 174                 quota *= (beacon_int - mvm->noa_duration);
 175                 quota /= beacon_int;
 176
 177                 IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
 178                                 le32_to_cpu(cmd->quotas[i].quota), quota);
 179
 180                 cmd->quotas[i].quota = cpu_to_le32(quota);
 181         }
 182 #endif
 183 }
 184
 185 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
 186                           bool force_update,
 187                           struct ieee80211_vif *disabled_vif)
 188 {
 189         struct iwl_time_quota_cmd cmd = {};
 190         int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
 191         struct iwl_mvm_quota_iterator_data data = {
 192                 .n_interfaces = {},
 193                 .colors = { -1, -1, -1, -1 },
 194                 .disabled_vif = disabled_vif,
 195         };
 196         struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
 197         bool send = false;
 198
 199         lockdep_assert_held(&mvm->mutex);
 200
 201         /* update all upon completion */
 202         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
 203                 return 0;
 204
 205         /* iterator data above must match */
 206         BUILD_BUG_ON(MAX_BINDINGS != 4);
 207
 208         ieee80211_iterate_active_interfaces_atomic(
 209                 mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 210                 iwl_mvm_quota_iterator, &data);
 211
 212         /*
 213          * The FW's scheduling session consists of
 214          * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
 215          * equally between all the bindings that require quota
 216          */
 217         num_active_macs = 0;
 218         for (i = 0; i < MAX_BINDINGS; i++) {
 219                 cmd.quotas[i].id_and_color = cpu_to_le32(FW_CTXT_INVALID);
 220                 num_active_macs += data.n_interfaces[i];
 221         }
 222
 223         n_non_lowlat = num_active_macs;
 224
 225         if (data.n_low_latency_bindings == 1) {
 226                 for (i = 0; i < MAX_BINDINGS; i++) {
 227                         if (data.low_latency[i]) {
 228                                 n_non_lowlat -= data.n_interfaces[i];
 229                                 break;
 230                         }
 231                 }
 232         }
 233
 234         if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
 235                 /*
 236                  * Reserve quota for the low latency binding in case that
 237                  * there are several data bindings but only a single
 238                  * low latency one. Split the rest of the quota equally
 239                  * between the other data interfaces.
 240                  */
 241                 quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
 242                 quota_rem = QUOTA_100 - n_non_lowlat * quota -
 243                             QUOTA_LOWLAT_MIN;
 244                 IWL_DEBUG_QUOTA(mvm,
 245                                 "quota: low-latency binding active, remaining quota per other binding: %d\n",
 246                                 quota);
 247         } else if (num_active_macs) {
 248                 /*
 249                  * There are 0 or more than 1 low latency bindings, or all the
 250                  * data interfaces belong to the single low latency binding.
 251                  * Split the quota equally between the data interfaces.
 252                  */
 253                 quota = QUOTA_100 / num_active_macs;
 254                 quota_rem = QUOTA_100 % num_active_macs;
 255                 IWL_DEBUG_QUOTA(mvm,
 256                                 "quota: splitting evenly per binding: %d\n",
 257                                 quota);
 258         } else {
 259                 /* values don't really matter - won't be used */
 260                 quota = 0;
 261                 quota_rem = 0;
 262         }
 263
 264         for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
 265                 if (data.colors[i] < 0)
 266                         continue;
 267
 268                 cmd.quotas[idx].id_and_color =
 269                         cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
 270
 271                 if (data.n_interfaces[i] <= 0)
 272                         cmd.quotas[idx].quota = cpu_to_le32(0);
 273 #ifdef CONFIG_IWLWIFI_DEBUGFS
 274                 else if (data.dbgfs_min[i])
 275                         cmd.quotas[idx].quota =
 276                                 cpu_to_le32(data.dbgfs_min[i] * QUOTA_100 / 100);
 277 #endif
 278                 else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
 279                          data.low_latency[i])
 280                         /*
 281                          * There is more than one binding, but only one of the
 282                          * bindings is in low latency. For this case, allocate
 283                          * the minimal required quota for the low latency
 284                          * binding.
 285                          */
 286                         cmd.quotas[idx].quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
 287                 else
 288                         cmd.quotas[idx].quota =
 289                                 cpu_to_le32(quota * data.n_interfaces[i]);
 290
 291                 WARN_ONCE(le32_to_cpu(cmd.quotas[idx].quota) > QUOTA_100,
 292                           "Binding=%d, quota=%u > max=%u\n",
 293                           idx, le32_to_cpu(cmd.quotas[idx].quota), QUOTA_100);
 294
 295                 cmd.quotas[idx].max_duration = cpu_to_le32(0);
 296
 297                 idx++;
 298         }
 299
 300         /* Give the remainder of the session to the first data binding */
 301         for (i = 0; i < MAX_BINDINGS; i++) {
 302                 if (le32_to_cpu(cmd.quotas[i].quota) != 0) {
 303                         le32_add_cpu(&cmd.quotas[i].quota, quota_rem);
 304                         IWL_DEBUG_QUOTA(mvm,
 305                                         "quota: giving remainder of %d to binding %d\n",
 306                                         quota_rem, i);
 307                         break;
 308                 }
 309         }
 310
 311         iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
 312
 313         /* check that we have non-zero quota for all valid bindings */
 314         for (i = 0; i < MAX_BINDINGS; i++) {
 315                 if (cmd.quotas[i].id_and_color != last->quotas[i].id_and_color)
 316                         send = true;
 317                 if (cmd.quotas[i].max_duration != last->quotas[i].max_duration)
 318                         send = true;
 319                 if (abs((int)le32_to_cpu(cmd.quotas[i].quota) -
 320                         (int)le32_to_cpu(last->quotas[i].quota))
 321                                                 > IWL_MVM_QUOTA_THRESHOLD)
 322                         send = true;
 323                 if (cmd.quotas[i].id_and_color == cpu_to_le32(FW_CTXT_INVALID))
 324                         continue;
 325                 WARN_ONCE(cmd.quotas[i].quota == 0,
 326                           "zero quota on binding %d\n", i);
 327         }
 328
 329         if (!send && !force_update) {
 330                 /* don't send a practically unchanged command, the firmware has
 331                  * to re-initialize a lot of state and that can have an adverse
 332                  * impact on it
 333                  */
 334                 return 0;
 335         }
 336
 337         err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0, sizeof(cmd), &cmd);
 338
 339         if (err)
 340                 IWL_ERR(mvm, "Failed to send quota: %d\n", err);
 341         else
 342                 mvm->last_quota_cmd = cmd;
 343         return err;
 344 }